Plastic article or earthenware shaping or treating: apparatus – Press forming means – press reshaping means – or vulcanizing... – Roll and coacting stationary shaping surface
Reexamination Certificate
1998-03-27
2001-10-16
Nguyen, Nam (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Press forming means, press reshaping means, or vulcanizing...
Roll and coacting stationary shaping surface
C425S335000, C162S197000, C162S270000, C493S459000, C493S461000
Reexamination Certificate
active
06302678
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device with which flexural or elastic materials can be worked in achieving a desired non-stressed shape, such as a flat shape. Such materials may be substrates or other rollable materials having a constant thickness which are worked as individual sheets or as an endless material web.
2. Description of the Background
Due to it being supplied as a reeled material, for instance, paper tends to curl, i.e. a portion of the web spread out flat is subject to an inherent bending stress and thus tends to curve or curl to relieve the stresses on release of external forces. However, it may also be wanted to bend or work a flat layer which is planar when free of stress so that it assumes a curved position. In any case, bending breaks a predetermined stress by moving the material on its face to which it is to be curved relative to a bending face. In this arrangement the material defines an angle of wrap in the portion coming into contact with the bending face. This angle of wrap is determined by the position of a deflector or guide for the material next the bending face. This deflector may be provided upstream and/or downstream of the bending face. For modifying the angle of wrap or for optionally working both faces of the material the deflector arrangement and the bending face means are expediently adjustable relative to each other. For this purpose the bending face may be positioned on the device frame so that it can be adjusted relative to the deflector during the entire bending operation, e.g. to transpose material sections in sequence having continuously changing tendencies into the same, non-stressed planar shape or the like. Such an adjustment may, however, result in a bulky configuration involving complicated control and inertia in control movements which makes it difficult to quickly react to varying curl tendencies or other properties of the material. If the length of the material section tensioned freely or linearly between the bending face and the deflection face is greater than the deflection radius of the deflection face the aforementioned drawbacks are likewise given and in addition to this material section may oscillate at high running speeds to the detriment of consistent good quality working.
OBJECTS OF THE INVENTION
An object is to overcome the drawbacks of known configurations or of the kind described. A wide variety of stresses should be introduceable into the material by simple constructional means.
SUMMARY OF THE INVENTION
In accordance with the invention the guiding face forming the deflection face and the bending face define as boundaries a relatively narrow gap which permits material to pass preferably free of compression stress. The clear width or the like of the gap is variable so that its minimum width is many times smaller than the cited deflection radius when the material wraps the bending face. This width can be measured in an axial plane of the deflection passing through the center of the bending face or of the angle of wrap. The minimum width may also be smaller than half, a quarter or a tenth of the deflection radius or smaller than 50 or 30 times the thickness of the material so that the free running zone between the two guiding faces is maximally as large as the deflection radius or smaller as compared thereto corresponding to one of the cited values.
Although in this case too, the bending face is positionally adjustable during bending operation it is, however, particularly expedient when thereby only the deflection is adjusted transverse to the deflection axis since then the distances and time required maximally for positioning are relatively small. The deflection face can thus be set tangentially to the plane of a flank connecting to the bending face and the tangential point can be continuously displaced from a position remote from the flank and opposing the bending face up to the flank face and a zone behind the bending face. This is especially achieved when the associated positioning axis is located away from the deflection axes of the deflection face upstream or downstream next to the bending face and thus the gap width is slightly altered by the positioning motion.
A web of paper to be subsequently worked is expediently secured with its leading edge to the overlapping trailing edge of an advanced paper web, e.g. by an adhesive tape before these ends or the seam reaches the working station. If the seam is passed on an arc or angle of wrap through the working engagement at the bending face or the like it may easily tear. This is why the guiding faces are mutually displaceable in a sudden short impulse such that the seam can be guided past one or both guiding faces without curvature or even contact, thus excluding damage.
Although the device can be made for bending engagement only on one face of the material, it is expediently configured for alternating bending engagement on both faces. For this purpose two separate deflecting faces are displaceable in common and two separate bending faces are mutually and separately adjustable relative to the device frame. The deflecting faces provided for this purpose, on the one hand, and the bending faces on the other are facing each other and are minimally spaced from each other by a spacing which is maximally as large as the deflection radius or smaller. The deflecting faces may be formed by rotational faces or rollers, the clear width there between as measured in their common axial plane being smaller than their radius. At both deflecting faces and at the bending face the material may be simultaneously guided and thus curved alternatingly in opposite directions.
In accordance with the invention fluid or suction means is provided with which particles of dust, paper or the like can be permanently exhausted more particularly in the region of the guiding faces or gap. A suction port adjoining the gap or the guiding faces is shaped expediently, as viewed axially, other than circular, more particularly oblong so that in the associated gap boundary only a single suction orifice extending over the full gap length is necessary. Such a configuration is substantially simpler to produce than orifices arranged in a grid pattern.
The bending face is expediently arranged on a plate or slat-like or similar type reversible body which can be replaced as a module without needing to destroy any part of it or its fastener means and can be thus reinserted in reversed positions so that a further bending face of three, four or more such faces is in place for workingly engaging the material. Accordingly, these bending faces working alternatingly may be configured in one part. However, the bending face may also be formed by a rotational face, for example, a round rod, instead of an edged face.
To facilitate changing the bending body, together with a support body such as a rod, where necessary, its fastening to the device frame is suitable for radial removal, i.e. for removal transversely to the longitudinal direction of the bending face or to the width extension of the material. Removing or changing can thus also be done when the material regularly passes through the device, the same applying also to the deflector arrangement or the individual deflector bodies.
In a further aspect of the invention the guiding faces are slantingly adjustable relative to each other or relative to the material or the running direction or the like, more particularly as viewed at right angles to the longitudinal direction of the guiding faces so that varying wrap angles or gap widths can be achieved over the width of the material. This adjustment is possible during bending operation.
REFERENCES:
patent: 2070505 (1937-02-01), Beck
patent: 3649447 (1972-03-01), Turner
patent: 3661703 (1972-05-01), Shelor
patent: 3772145 (1973-11-01), Notbohm
patent: 4013284 (1977-03-01), Demetre
patent: 4111745 (1978-09-01), Manfredi
patent: 4539072 (1985-09-01), Frye et al.
patent: 5009749 (1991-04-01), Cederhollm et al.
patent: 5154688 (1992-10-01), Boyd
patent: 5269743 (1993-12-01), Sakuma
bielomatik Leuze GmbH & Co.
Nguyen Nam
Nguyen Thu Khanh T.
Senterfitt Akerman
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